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Changes in the phase structure of the polyethylenes after long-time storage at room temperatures

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Summary

The long-time crystallization of a set of polyethylenes, that have a variety of different molecular structures, has been studied under storage conditions well removed from those where partial melting or relatively rapid crystallization takes place. For high molecular weight linear polyethylenes, branched polyethylenes and ethylene copolymers a density increase of about 5% is observed. However, analysis of the Raman internal modes indicates that the core crystallinity remains constant. It is found that the density change reflects an increase in the partially ordered interfacial region at the expense of the disordered liquid-like region.

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Author notes

  1. K. W. McLaughlin

    Present address: Chemistry Department, University of Southern Indiana, University Boulevard, 47712, Evansville, IN, USA

Authors and Affiliations

  1. Department of Chemistry and Institute of Molecular Biophysics, Florida State University, 32306, Tallahassee, FL, USA

    R. G. Alamo, K. W. McLaughlin & L. Mandelkern

Authors
  1. R. G. Alamo
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  2. K. W. McLaughlin
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  3. L. Mandelkern
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Alamo, R.G., McLaughlin, K.W. & Mandelkern, L. Changes in the phase structure of the polyethylenes after long-time storage at room temperatures. Polymer Bulletin 22, 299–306 (1989). https://doi.org/10.1007/BF00282856

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  • DOI: https://doi.org/10.1007/BF00282856

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